This is a device that fits over your face like a respirator. Only, instead of having filters and what-nots, it just has tubes that snake over your shoulders and down your back and attach at your lower back, just above your pants.

The idea is that instead of filtering fume components out of the danerous
air just above your face, arising from whatever industrial/chemical thing you're working on, it instead draws the air from behind you, and more or less below the workspace area, away from the fumes.

If that's still in the danger area, the tubes can be extended on a cart and push away to an area further away from the workspace.

We tried this at BUNGCO but it turned out there were
often plenty of fumes behind at belt level.
Putting the tubes directly into the pants did not help.
At all. We still get the "belt breather" out to haze
new employees or desperate vendors.